Portable crane



Nov. 25, 1930. A. A. BUREAU 1,782,406

PORTABLE CRANE Filed sept. 27, 1928 vUlN-'IL'IED* .STA TES NP AT'ENT GFI-"ICE i Patented Nov. Y 25, 14930 Aitrnun Argentin 'BirnEAmor CHICAGO, IlLL'IYoIs; Assrenonmo wEsTEnNnLnoTn-Ic viconrienmr, rnconroniefrnn, ornn'w YORK, N; Y.",A` conronnttronornnw Yom; e

Pon'rABLE CRANE Appiicatlinnniedwsptemter 27', 192e. serial No. 308,601.

This `invention A`relates'` to portable cranes, and more particularly to lan` auxiliary support for portable crane trucks.

The principal object" of the` invention is to providey an auxiliary support `for portable `cranes which is rendered effective bythe movement of the crane arm for' properly bracing and supporting the crane. i

In accordance with the general `features ofV the invention, there is provided in one embodiment thereof aportable crane supporting truck having an auxiliary supporting member adapted to be extended by the swmgingmovement of the crane arm or gib from the side of the'truclz to which the gib is swung so as'to prevent overturning `of the crane truck due to the Weight supported by g the gib.

A clear understanding ofthe invention .n may be had from the following detailed descriptionV of one embodiment of the` novel structure taken in connectionwith the accompanymg drawing, wherein Fig. 1 is a side elevational view of .a crane truck having an extendable auxiliary support embodying the invention;

` Fig. 2 is a in Fig. 1; i

FigQS is an enlarged fragmentary plan section-taken on line 3*-73 of Fig. 1, and

Fig. t is a Vfragmentary vertical section taken on line 4-#4 of Fig. 3.

Referring'to the drawings, wherein like numeralsareused to designate similar parts throughoutthe various figures, it'willr be ob-V served that a portable `truck is designated generally bythe numeral 10 and comprises a wheeled platform 11 on which is mounted vertical framework 12 for supporting a ro- `tatablecrane mast or post 13 from which proj ectsa eranearm or gib 14 whichis adapted-to transfer material tol and from the truck platforn'i. The usual hoisting cable 16 is attach'edf at one end toa winding drum 17 from .g which it passes around guide pulleys 18, 18

depending from the truck platform and over guide pulleys 19, 19 carried by the gib 14.

An auxiliary support `is provided for preventing` overturning` of the truck due to the weight of the material supported by the crane plan view of-thestructure shown" when the swung toweither sideof the I i truck. In the Apresent`embodiment .of the invention this support consists of abar or sill 20 .disposedbeneath the platfornr 11` and slidable transversely thereof between apair v a free and smooth movementyofqthe bar,`

i As shown( in Fig.A 11,1 efrertically disposed hollow shaft 28 is` connected at its upper end to the @rane mast-13s@ als: tmb@ (rotatable i therewith enduit 1191.1.limled at. its lower .end inthe truck, Platform-11E at imitated-at 26;

A* ,gear 2f( weurecll to the. lower t end` of the Statt. ZSLmQShes with` an' gear QSrotatf ably mounted Q11 .a vertical Statt Shaft -29 iourneled horizontal `plates `3l andf se- Cuted .to the ttpftnid betteln, resnettvely, 0f the `truckgplfttfotln llyasyclsarly shewnfin `4f?.Y gear. 3;4 meshing with naar .28.; AiS secured tetr vertical Statt wtttthlyfiour: nale@ in the nlatesfl; and f Th @hatt 3 5 gearSG secured thereto meshesliwith a rack secured to or formed integral `n fiththesupI tortille bar 20. ltrom the eollstrutton just 1` desrbed it' will fbegobvions that the-swinging of the cranefgib to eitliensidje of:l the truck simultaneously,causes theauxiliary supporting ,Yar to benhextended lf roin the ,side of the `truck towhieh tthe giblis swung.`

. v ,The lQperat'on `ofthe invention,is` l, l

t to @be apparent from the above descritti@ and, the accompanying drawing. lllhen the gib 14 is `rotated to either side ,of the` truck theshafti 23 rotating` therewith ,actuates` the statig?, which through the idler` 0f nterf mediate .gear ,28 ac tuatesfthegear 36 `which meshes :Withqthei rack `38 secured l ,to-the supse extends downwardly froingthe plate32 `andga ing bar 20 thus extended, any possible overturning of the truck due to the load supported by the gib 14 is positively prevented. It is obvious that with the disclosed gear mechanism the support-ing bar 20 is automatically extended to either side of the truck to counteract the overturning bending movement that may be set up by a load suspended from either side. I'Vhen the gib 13 is rotated to its normal, yinoperative position longitudinally of the truck, as shown in Fig. l, the auxiliary supporting bar 2O is centrally located with respect to the base l0, and when so positioned the truck may be convenient-ly transported through comparatively narrow aisles, which renders it desirable for use in manufacturing establishments.

It is to be understood7 of course, that the invention is not limited to the speciicI embodiment disclosed, but is capable of numerous other applications within the scope of the appended claims.

Vhat is claimed is:

1. In a crane, a supporting frame, a mast rotatably supported thereby, a gib carried by said mast and rotatable therewith, an auxiliary crane supporting member extendible horizontally from the frame, and means actuated by the rotation of the gib for extending the member :from the frame.

2. In a crane, a supporting` frame, a horizontally rotatable gib supported therein, an auxiliary frame supporting member slidable on the frame, and means actuated in response to a rotary movement of the gib for rendering the member effective.

3. In a crane,.a portable-truck, a mast rotatably supported thereby, a gib carried by said mast and rotatable therewith, an auxiliary crane supporting member secured to the truck and extendible from opposite sides thereon-and means actuated by a rotary movement of the gib for simultaneously extending the member fronr a side of the truckV in accordance With the direction of the movement of the gib.

4. In a crane, a base a rotatable mast supported by the base a gib carried by said mast and rotatable therewith to either side of the base, an auxiliary supporting member attached to the base and extendible from the side of the base to Which the gib is rotated to prevent the base from tipping, a raclr connected to the auxiliary supporting member, and gear mechanism connected to the gib for actuatingthe rack contemporaneously With the rotation of the gib.

5. In a crane, a supporting frame, a mast rotatably supported therein, a gib carried by said mast and rotatable therewith, an auxiliary crane supporting member slidable gib horizontally rotatable thereon, an auxiliary crane supporting member extendible from the truck, and means horizontally actuated by a rotary movement of the gib for extending the member from the truck simultaneously with the movement of the gib.

7. In a crane, a portable truck, a mast rotatably supported thereby, a gib carried by said mast Vand horizontally rotatable therewith, an auxiliary crane supporting member secured to the truck and extendible therefrom, and means connected to the mast and the auxiliary member for extending the latter simultaneously with the rotation ol the gib.

In Witness whereof, I hereunto subscribe my name this 15th day of September, A. I).

ARTHUR ALFRED BUREAU.

in the frame, and means interposed between the mast and the auxiliary member for sliding the latter out from the frame. Y

6. In a crane, a portable supporting truck,

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